[SUGGESTION] Kayn evolution/ultimate interaction

A lot of people are complaining about the general the lack of control you have over choosing your evolution path and that when you fall really behind on your evolution you are effectively dead in the water (moreso with SA path).

Why not give Kayn an interaction with his ult to solve both of these problems? I suggest that using your ultimate on someone gives a huge chunk of passive exp, maybe even grant a bonus if it is used to kill the enemy (like zed ult).

I see no real downsides, you don't really get your ultimate until 8m so it wouldn't allow you to evolve too early. It would reward having a good early game by allowing you too easily secure a fast evolution or allow you an opportunity to catch up if you are behind and overall just give the player more control on the game. I think it is well known that Kayn has a bad early game and this would make picking him much more consistent and feel less feast or famine which is imo much better in terms of balance.

Also thematically it makes a lot of sense, if you gain essence by damaging champions then shouldn't infesting their body and bursting out generate a huge amount of essence?

Overall I think the change I suggested would make the champion feel a lot better both thematically and mechanically as well as give Kayn some much needed early game consistency.